Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar
We investigated the rupture dynamics of the 2025 Mw 7.7 Mandalay, Myanmar earthquake, using a video recording of surface rupture, strong motion recordings, waveform simulation, and satellite imagery. Our assessment, based on the S-wave observation in the video and rupture arrival time at a seismic...
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McGill University
2025-08-01
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| Series: | Seismica |
| Online Access: | https://seismica.library.mcgill.ca/article/view/1785 |
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| author | Shiro Hirano Ryosuke Doke Takuto Maeda |
| author_facet | Shiro Hirano Ryosuke Doke Takuto Maeda |
| author_sort | Shiro Hirano |
| collection | DOAJ |
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We investigated the rupture dynamics of the 2025 Mw 7.7 Mandalay, Myanmar earthquake, using a video recording of surface rupture, strong motion recordings, waveform simulation, and satellite imagery. Our assessment, based on the S-wave observation in the video and rupture arrival time at a seismic station 246 km south of the hypocenter, suggests that rupture decelerated to subshear speeds (~3 km/s) from initial supershear propagation (~6 km/s) before reaching the camera location. This deceleration is also supported by comparison between the fault-normal acceleration patterns seen in the video and that simulated by kinematic rupture modeling. Additionally, satellite imagery indicated a local minimum in slip (2-3 m) approximately 40-60 km south of the epicenter, suggesting a region of reduced stress drop that likely caused the temporary deceleration. Beyond this point, the rupture appears to have re-established supershear propagation.
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| format | Article |
| id | doaj-art-62e7ba1aec1c42ac97fcd887873549ac |
| institution | Kabale University |
| issn | 2816-9387 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | McGill University |
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| series | Seismica |
| spelling | doaj-art-62e7ba1aec1c42ac97fcd887873549ac2025-08-20T03:58:08ZengMcGill UniversitySeismica2816-93872025-08-014210.26443/seismica.v4i2.1785Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in MyanmarShiro Hirano0Ryosuke Doke1Takuto Maeda2Hirosaki University, Hirosaki City, Aomori, JapanHirosaki University, Hirosaki City, Aomori, JapanHirosaki University, Hirosaki City, Aomori, Japan We investigated the rupture dynamics of the 2025 Mw 7.7 Mandalay, Myanmar earthquake, using a video recording of surface rupture, strong motion recordings, waveform simulation, and satellite imagery. Our assessment, based on the S-wave observation in the video and rupture arrival time at a seismic station 246 km south of the hypocenter, suggests that rupture decelerated to subshear speeds (~3 km/s) from initial supershear propagation (~6 km/s) before reaching the camera location. This deceleration is also supported by comparison between the fault-normal acceleration patterns seen in the video and that simulated by kinematic rupture modeling. Additionally, satellite imagery indicated a local minimum in slip (2-3 m) approximately 40-60 km south of the epicenter, suggesting a region of reduced stress drop that likely caused the temporary deceleration. Beyond this point, the rupture appears to have re-established supershear propagation. https://seismica.library.mcgill.ca/article/view/1785 |
| spellingShingle | Shiro Hirano Ryosuke Doke Takuto Maeda Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar Seismica |
| title | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar |
| title_full | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar |
| title_fullStr | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar |
| title_full_unstemmed | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar |
| title_short | Supershear-subshear-supershear rupture sequence during the 2025 Mandalay Earthquake in Myanmar |
| title_sort | supershear subshear supershear rupture sequence during the 2025 mandalay earthquake in myanmar |
| url | https://seismica.library.mcgill.ca/article/view/1785 |
| work_keys_str_mv | AT shirohirano supershearsubshearsupershearrupturesequenceduringthe2025mandalayearthquakeinmyanmar AT ryosukedoke supershearsubshearsupershearrupturesequenceduringthe2025mandalayearthquakeinmyanmar AT takutomaeda supershearsubshearsupershearrupturesequenceduringthe2025mandalayearthquakeinmyanmar |